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Kyung-Whee (Minho) was bullied when he was high school student. At that time, he liked Na-Bi (Lee Yoo-Bi). She was his first love, but she died. Now Kyung-Whee is a resident in orthopedics. To save Na-bi, Kyung-Whee travels back in time to when he was 18 years old. 👨‍👨‍👧‍👦 Cast 👨‍👨‍👧‍👦 Minho - Oh Kyung-WheeLee Yoo-Bi - Han Na-BiKim Bo-Mi - Oh Yi-DoYoo Joon-Hong - Ma Ki-Ho